Ultrasound wattmeter

Details Ultrasound wattmeter Ultrasound wattmeter

1978-01-17

1980-01-01

Ciarlante, Anthony V.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01H 310

Patent

active

041810040

ABSTRACT:
An ultrasound wattmeter for measuring the magnitude of energy radiated by a therapeutic ultrasound applicator includes a sealed, oil-filled housing within which a float assembly is suspended. The float assembly includes an ultrasound reflective float as well as a coil and a vane supported by the float. The float assembly assumes a null position in the absence of ultrasonic radiation. A window in the housing permits the application of ultrasonic energy from the applicator to the float for urging the float assembly in one direction from the null position. A magnet mounted on the housing adjacent the coil urges the float assembly in the opposite direction in response to energization of the coil. A light source and a light responsive device are located adjacent the vane for providing a position signal corresponding to the position of the float assembly. An energization circuit energizes the coil in response to variations in the position signal in order to maintain the float assembly in its null position, and a meter coupled to the energization circuit provides an indication of the coil energization level which also is an indication of the ultrasonic energy radiated by the applicator.

REFERENCES:
patent: 2531844 (1950-11-01), Fiedler
patent: 2827978 (1958-03-01), Henry
patent: 2874794 (1959-02-01), Kiernan
patent: 2939542 (1960-06-01), Weller et al.
patent: 3626364 (1971-06-01), Simon
patent: 3915017 (1975-10-01), Robinson
Hueter et al., Sonics, John Wiley and Sons, Inc., New York, 1955 pp. 45-49.
J. A. Rooney, Determination of Acoustic Power Outputs in the Microwatt--Milliwatt Range, Ultrasound in Med. and Biol., vol. 1, No. 1, Sep. 1973, p. 13-16, Pergamon Press, Gr. Br.

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